Trimming mechanism for sewing-machines



(No Model.)

. T. BRIGGS.

TRIMMING MECHANISM FOR SEWING MACHINES. N0.-266,012. v Patented Oct. 1'7, 1882.

Fig 2 Why-25525. II K/EFUDK 2720mm; 2723 a 4mm I JEZZJG- i UNITED STATES PATENT OFFICE.

THOMAS BRIGGS, OF LYNN, MASSACHUSETTS.

TRIMMING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 266,012, dated October 17, 1882.

Application filed March 6, 1882.

(No model.)

To all whom it may concern:

Be it known that I, THOMAS BRIGGS, of Lynn, countyofEsseX, Stateot' Massachusetts, have invented an Improvement in Trimming Mechanism for Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification.

My invention relates to improvements in the throat-plate which co-operates with the trimming-blade; and it consists in a disk or plate provided with two or more faces adapted to be brought at the proper timeinto position to form part of the wall ofthe slot in the plate through which the trimmer descends to trim the mate rial close to the seam being sewed, the said disk being adapted to be rotated so as to place either of its straight. edges in position to form part of the trimmerslot in the usual throatplate.

Figure 1 represents a broken side elevation of a trimmer and throat-plate provided with one of my dual-faced disks. Fig. 2 is a top view of the throat-plate with my dual-faced disk in position. Fig. 3 shows the disk detached, and Fig. 4 a form of screw-driver by which the said disk may be readily adjusted or turned one-fourth around to bring a new face of the disk into position to form part of the trimmerslot.

The knife, blade, or chisel a, of usual construction, has its guiding-end or finger a eX- tended down through the triminerslot2 in the throat-plateb, nearthe usualneedle-hole,c. The top of the throat-plate is recessed, as shown, to

receive the dual-faced disk (I, it being shaped to present two or more faces, as shown at 3 4 5 6, either of which, by the partial rotation of the said disk, maybe placed in position to form one side of the trim mer-slot next to the path of thecutting-edge 8 ot' the trimmer a. VVhenever the slot in which the trimmer descends to trim the material becomes worn a new surface may be brought into position by turning the disk (1 about its central pivot, 10, shown as a screw extended through the-disk, the throatplate, and a nut, g, thus bringing another of the adjacent straight edges of the disk into the slot 2.

The screw-driver employed to move the disk is shown at hin Fig. 4, its prongs beingada-pted to enter the holes 13 in the disk.

The cutter or trimmer will be reciprocaied in any usual manner.

I claim The throat-plate having the slot 2 forthe action of the trimmer, combined with the disk having two or more straight faces adapted to be brought, when desired, into position to form one side of the trimmer-slot, substantially as and for the purpose described.

In testimony whereoflhavesigned my name to this specification in the presence of two'subscribing witnesses.

THOMAS BRIGGS.

Witnesses:

Jos. P. LIVERMORE, BERNICF. J. N OYF-S. 

